Mac Application Build Fails When Linking QtAccessibleWidgets

I'm evaluating accessibility on the Mac using Qt and have run into a problem getting a test application to build. The app is based on the stylesheet example and I'm just trying to rebuild it with accessibility. The demo version of stylesheet doesn't work at all with Mac VoiceOver but Qt docs state that accessibility is available using the Carbon-based Qt package. I'm trying to verify this but no joy thus far.

The build error is Undefined symbols for architecture i386 qt_plugin_instance_qtaccessiblewidgets()", referenced from:... with a snip from the compile output below: